package com.servlet;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * @Discription:
 */
public class uploadServlet extends HttpServlet {
    //用来处理上传的数据
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //判断上传的数据是否是多段数据（只有是多段数据才是文件上传的）
        if (ServletFileUpload.isMultipartContent(req)){
            //创建FileItemFactory 工厂实现类
            FileItemFactory fileItemFactory = new DiskFileItemFactory();
            //创建用于解析上传数据的工具类ServletFileUpload
            ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);

            try {
                //解析上传的数据得到每个表单项FileItem,错误信息包裹
                List<FileItem> list = servletFileUpload.parseRequest(req);
                //循环判断，每个表单项，是普通类型还是上传的文件
                for (FileItem fileItem : list) {
                    if (fileItem.isFormField()){
                        //普通文件
                        System.out.println("表单项的name属性值："+fileItem.getFieldName());
                        //参数UTF-8解决乱码问题
                        System.out.println("表单项的value属性值："+fileItem.getString("UTF-8"));
                    }else {
                        //上传的文件
                        System.out.println("表单项的name属性值："+fileItem.getFieldName());
                        System.out.println("上传的文件名；"+fileItem.getName());
                        fileItem.write(new File("e:\\"+fileItem.getName()));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
